How to assign vectors to existing vector

Question

karishma koshy 2019-8-7

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编辑： madhan ravi 2019-9-15

Hi all

I want to assign a set of vectors in place of zero to existing vectors (ventor_2). But I always want to check the the new set of vectors (newvector_2) does not have the number that exist in previous vector (vector_1)

Vector_1 = [ 1 2 3 4]

Vector_2 = [ 2 0 4 0 6 7 ] Newvector_2 = [ 2 5 4 8 6 7]

How can I do that

Thank you

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karishma koshy 2019-8-7

Yes, it should be in the chronological order

karishma koshy 2019-8-7

编辑：karishma koshy 2019-8-7

@Guillaume I have got a set vectors vector_1 before vector_2. So I want to confirm that newly assigned numbers to newvector_2 are not present in vector_1. I know how to check for a single number . But how can I do it for all the numbers in the vector?

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Answer 1

Samatha Aleti 2019-8-12

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Without logically going to each element you can use functions like find(), intersect(), setxor() for vectorization in achieving what you need. Here is how you can do it:

vector_1 = [ 1 2 3 4]; 
vector_2 = [ 2 0 4 0 6 7]; 
% x is the vector whose elements are to be added to vector_2 
x = [1 2 5 8]; 
xcommon = intersect(x, vector_1); 
vector_3 = setxor(x,xcommon);  
idxZero = find(~ vector_2); 
% Truncate additional elements 
vector_3(length(idxZero)+1:length(vector_3)) = []; 
vector_2(idxZero) = vector_3; 

For detailed information on above functions, refer the following document links:

intrersect, find, setxor

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madhan ravi 2019-8-12

Where did x come from?

Samatha Aleti 2019-8-12

I took "x" as an example here. In your case "x" is the vector set whose elements are to be added in place of zeros of vector_2.

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Answer 2

madhan ravi 2019-8-12

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https://ww2.mathworks.cn/matlabcentral/answers/475314-how-to-assign-vectors-to-existing-vector#answer_387213

编辑：madhan ravi 2019-9-15

在 MATLAB Online 中打开

newvector_2=vector_2;
ix=nnz(~vector_2);
v12=[vector_1,nonzeros(vector_2).'];
u=unique(v12);
d=setdiff(1:max(v12),v12);
newvector_2(~vector_2)=[d,max(v12)+(1:ix-numel(d))]       

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Answer 3

Andrei Bobrov 2019-8-12

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https://ww2.mathworks.cn/matlabcentral/answers/475314-how-to-assign-vectors-to-existing-vector#answer_387251

在 MATLAB Online 中打开

Let X - interval for input data in 'vector_2'

X = [0, 15];
x = setdiff(X(1):X(2),vector_1); % input data
newvector_2 = vector_2; 
lo = vector_2 == 0;
n = sum(lo);
b = repmat(x,1,ceil(n/numel(x)));
newvector_2(lo) = b(randperm(numel(b),n));